Sorry to not address you specifically. This is from a post I made regarding the same large Iris box you found at Walmart. The post addresses some of the specific concerns of the originator of that thread but I think it is still relevant to your rack. I need to run out and buy one more Xmas gift (tools, ironically). Please let me know if you have anymore specific questions. Hope you can filter through and get what you need below.

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I've built several large box racks, but nothing quite approaching the size you listed. I also have extensive venomous experience and have built racks for them and other fast moving species.



First and foremost, I have a couple of comments about your box selection. If it's the same Iris box I'm thinking of, there are two things you should consider.



First, the lid of this box is domed and contributues significanly to the listed height of this product. In a lidless rack system the actual height of this box will be well under 12" and probably closer to 10". I only saw this box in person one time, so I'm not exactly sure.



Something to think about if the species you're keeping is semi-arboreal. BTW, is this for Thrasops?



Secondly, at 53" long you could possibly waste a considerable amount of material since wood comes in 48" increments. Strongly consider having the carpenter cut strips of plywood and make frames to conserve wood. Thin pieces of material can be attached over or in the frame.



The are other solutions as well, but I won't get into those.



Given my extensive venomous experience, feel free to e-mail me to discuss the species you are keeping. I may have a box that is better suited to what you're trying to accomplish.



As far as heating the rack, I have a few different suggestions depending on what species this is for. Radiant heat panels are one of my ideas and would fit well with my suggestion above to use frames rather than solid pieces of wood for the shelves.



More comments:



A box this long may not function well in a lidless racks system. They often flex slightly when only partially open, causing the boxes to slide poorly. If this were for a Boomslang that could be a problem. I'd hate to have one of those launch itself onto my shoulder while I was trying to get the box back into the rack.



Any large box should absolutely slide out lengthwise. Boxes are most flexible at the midpoint of the long side and it's best to have these areas close to the sides of the rack. Furthermore, it's almost impossible to slide a box this big out sideways and have it remain stable. A huge safety issue for venomous species, or any species when you consider the boxes could fall.



I have numerous other ideas and concerns about this rack. If you feel more comfortable discussing the species in questions offline, feel free to e-mail me.



I do not keep any dangerous snakes at the moment, but I do keep Gonyosoma which is a very fast and agile species. I keep them in lidless racks and can tell you they can be a nightmare in a rack that does not function well. Depending on the species you are working with there may be better options.



Lastly, if we don't discuss this further, please make sure to have the gap in the rack at least 1/8". Any less can be a problem for large boxes. In fact I prefer to build them with a 1/4" gap and then shim some material to make the gap suitable for the species in question.

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